Method and arrangement for carrying out repair and/or maintenance work in the inner casing of a multishell turbomachine

Abstract

A relatively simple, effort-saving and cost-saving arrangement and a corresponding method for repair and/or maintenance work in the inner casing of a multishell turbomachine is provided. To this end, after a tool carrier is put into the outer casing of a turbinemachine, the connecting elements of top part and bottom part of the inner casing are slackened. The top part of the inner casing is then lifted in the outer casing to such an extent that the tool carrier can reach into the inner casing. To this end, at least one locating fixture for a lifting device is arranged on the top part. A radial distance is formed between the at least one outer casing and the inner casing, the radial distance corresponding to at least the radial extent of a tool carrier to be introduced into the inner casing.

What is claimed as new and desired to be secured by Letters Patent of the United States is:  
     
       1. A method of carrying out repair and/or maintenance work in the inner casing of a multishell turbomachine, which in addition to the inner casing has at least one outer casing, the inner casing consisting of a top part and a bottom part connected to one another via connecting elements, in which method: 
       a) placing a tool carrier equipped with appropriate tools into the at least one outer casing via at least one closable installation aperture of said outer casing;  
       b) slackening the connecting elements of the top part and the bottom part; and  
       c) lifting the top part of the inner casing in the outer casing to such an extent that the tool carrier can reach into the inner casing.  
     
     
       2. The method as claimed in claim  1 , further including the step of: 
       introducing a lifting device from outside through the at least one outer casing and fastening the lifting device to the top part of the inner casing.  
     
     
       3. The method as claimed in claim  2 , wherein the lifting device, once installed, remains permanently on the top part of the inner casing. 
     
     
       4. An arrangement for carrying out repair and/or maintenance work in the inner casing of a multishell turbomachine, which in addition to the inner casing has at least one outer casing provided with a closable installation aperture, the inner casing consisting of a top part and a bottom part connected to one another via connecting elements, wherein at least one locating fixture for a lifting device is arranged on the top part, and a radial distance is formed between the at least one outer casing and the inner casing, the radial distance corresponding to at least the radial extent of a tool carrier to be introduced into the inner casing. 
     
     
       5. The arrangement as claimed in claim  4 , wherein the top part of the inner casing has a geodetically highest casing part, the locating fixture for the lifting device being arranged on this casing part or on either side of the latter, and the at least one outer casing being provided with at least one aperture, in alignment with the locating fixture, for an actuating element connected to the lifting device. 
     
     
       6. The arrangement as claimed in claim  4 , wherein a parting plane is formed between the top part and the bottom part of the inner casing, and the locating fixture for the lifting device is fastened to the top part of the inner casing in the region of the parting plane of the latter. 
     
     
       7. The arrangement as claimed in claim  6 , wherein the lifting device is arranged at least on one side on the top part of the inner casing. 
     
     
       8. The arrangement as claimed in claim  6 , wherein the lifting device is firmly installed on the top part of the inner casing. 
     
     
       9. The arrangement as claimed in claim  4 , wherein the multishell turbomachine is a gas-turbine plant, the outer casing is the outer casing of the gas-turbine plant, and the inner casing is the combustion-chamber casing of the gas-turbine plant.